Guys, quick Q:
What would you recommend as the best (polished, easy/intuitive UI, reliable) Lightning wallet? It should be able to run on either Android, or Windows (ideally on both, with synching between them).
Made a small payment on-chain y'day, with low fees, and it's still pending...

I hope you can handle it on your PC so you can use "Electrum" is the best (I hope available PC and Phone).
But you can use only a phone and then "trustwallet" for more future and multi-currency.
it is just personal opinion, (right now fee is high all wallet).

You can try
"BTC Transaction Accelerator". right now "Remaining hourly FREE transactions have vanished" you can try next hour it's workable.
Edite.
I didn't know Electrum can do Lightning... But I'm a total noob when it comes to Lightning...
Will look into it, thanks.
BTW, I've just used your ViaBTC Transaction Accelerator link, and it worked! I had to wait for the counter to reset to 100 free TXIDs, exactly on the hour. Nice service, bookmarked.
Thanks for that too. Merited.
Ugh. Electrum CAN do lightning. But do not start there. It's complicated and kludgey (Still such a great on chain wallet).
Non Custodial: Breez
Custodial: Wallet of Satoshi
Coming soon: Green
I mention WoS just because it is the drop dead easiest, best working wallet available. But custodial wallets run an ever increasing risk of getting frozen by regulators.
I feel like Breez works the best for the non-custodial wallets, but it requires a little patience up front.
Green should get interesting as they are a very easy to use wallet and are JUST rolling out lightning.
I like the Green Wallet, and thanks for letting us know they are working on Lightning. Green allows RBF and Coin Control.
With the extremely high fees, the time is coming when I need to learn how to use Lightening.